Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1ce2bab03aaabc142c2f0510a16c62901de9c18fcd22d0cac480a92d74c6db' 
  AND token = '/KDdHdVIAH/Fu7mk1j+m2Wn+NzgWN35T0nrTIFqhYIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}